地空导弹群火力优化分配模型

地空导弹群火力优化分配是对多批空中目标分别选择最有效的地空导弹火力单元进行拦截,形成最佳兵力、兵器使用方案,它是地空导弹武器指控系统的一项重要功能。从研究地空导弹群火力优化分配过程出发,建立了地空导弹拦截适宜性检查模型、射击优先度指标计算模型和火力分配方案优化模型,为仿真地空导弹群火力优化分配过程提供了模型依据。     

"M/M/1"在单火力单元射击多目标火力分配中的应用

在单服务台排队系统理论的基础上,建立了单火力单元对多个目标射击的系统仿真模型,对此模型进行了分析,给出了模型的适用范围,并通过在计算机上仿真运行实例,验证了该仿真模型的正确性.该方法是一种有益的尝试与探索,对局部作战指挥决策有一定的参考价值.     

编队对地攻击联合火力分配问题的Swt-opt算法

根据未来战争中编队对地攻击的特点,运用一致算法(consensus algorithm)的思想对Swt-opt算法进行改进,解决关于传感器-武器-目标的联合火力分配问题。改进算法继承了Swt-opt算法解决资源分配问题在通信、计算以及对战场态势的容错能力方面的优势,克服了Swt-opt算法受限于网络拓扑结构的缺点。最后,证明了改进算法的可行性,并运用Matlab对改进算法进行了仿真实现。     

A standardized scan statistic for detecting spatial clusters with estimated parameters

The scan statistic based on likelihood ratios (LRs) have been widely discussed for detecting spatial clusters. When developing the scan statistic, it uses the maximum likelihood estimates of the incidence rates inside and outside candidate clusters to substitute the true values in the LR statistic. However, the parameter estimation has a significant impact on the sensitivity of the scan statistic, which favors the detection of clusters in areas with large population sizes. By presenting the effects of parameter estimation on Kulldorff's scan statistic, we suggest a standardized scan statistic for spatial cluster detection. Compared to the traditional scan statistic, the standardized scan statistic can account for the varying mean and variance of the LR statistic due to inhomogeneous background population sizes. Extensive simulations have been performed to compare the power of the two cluster detection methods with known or/and estimated parameters. The simulation results show that the standardization can help alleviate the effects of parameter estimation and improve the detection of localized clusters. © 2012 Wiley Periodicals, Inc. Naval Research Logistics, 2012     

载荷分布对六自由度运动平台动力学性能的影响

用Newton-Euler方法,分析了运动平台的力矢和力矩,建立了统一的六自由度运动平台动力学方程。利用该方程研究了不同载荷分布时六自由度运动平台各液压缸的受力情况,并用Matlab进行了计算。结果表明,不同载荷分布时,某些液压缸的驱动力的最大值成倍增加,变化极为复杂,为六自由度运动平台的设计及控制提供了理论指导。     

二元翼型跨音速非定常压力计算

本文描述了用Ｅ—Ｏ型的ＡＤＩ隐式差分格式计算二维、无粘、定常与非定常低频小扰动跨音速流的方法。应用附加时间导数项的物面、尾涡面的边界条件及压力系数表达式和远场无反射边界条件,计算翼型绕其１／４弦长处轴作正弦俯仰振动时,翼面上的非定常压力分布。所得结果与文献［１］比较,具有较好的一致性。     

定数截尾的恒定应力加速寿命试验的优化设计

在指数分布场合下讨论了恒加试验的最优设计问题 ,得到了一系列与步加试验相对应的结果 .这里的最优准则是指正常应力水平下产品对数平均寿命估计的方差的极小化 .     

一种新型的目标分配形式及算法

提出了一种新型的目标分配形式--顺序攻击目标分配形式,并以地空导弹拦截攻击机机群为研究对象,给出了均匀目标分配形式和顺序攻击目标分配形式,以及在机群无干扰武器和有干扰武器状态下,地空导弹拦截效果的算法模型.数值分析表明,顺序攻击目标分配形式有较好的攻击效果.     

基于两种密码体制结合的网络数据安全模型

利用密码学的方法来解决网络数据传输的安全性问题。在分析对称密码体制和公开密钥体制的代表DSE和RSA算法的优缺点后,提出将两种算法结合的网络数据安全系统的模型。     

Investigation on the spatial distribution characteristics of behind-armor debris formed by the perforation of EFP through steel target

The behind-armor debris (BAD) formed by the perforation of an EFP is the main damage factor for the secondary destruction to the behind-armor components. Aiming at investigating the BAD caused by EFP, flash X-ray radiography combined with an experimental witness plate test method was used, and the FEM-SPH adaptive conversion algorithm in LS-DYNA software was employed to model the perforation process. The simulation results of the debris cloud shape and number of debris were in good agreement with the flash X-ray radiographs and perforated holes on the witness plate, respectively. Three-dimensional numerical simulations of EFP's penetration under various impact conditions were conducted. The results show that, an ellipsoidal debris cloud, with the major-to-minor axis radio (a/b) smaller than that caused by shaped charge jets, was formed behind the target. With the increase of target thickness (h) and decrease of impact velocity (v₀) and obliquity (θ), the value of a/b decreases. The number of debris ejected from target is significantly higher than that from EFP. Based on the statistical analysis of the spatial distribution of the BAD, An engineering calculation model was established considering the influence of h, v₀ and θ. The model can with reasonable accuracy predict the quantity and velocity distribution characteristics of BAD formed by EFP.